Prosecutors on Friday held up a gray sweatshirt, decorated with Looney Tunes cartoon characters, identical to a missing shirt that Angela Davis said belonged to her slain 12-year-old son.

With eyes blurred with tears, Davis had earlier told the court how her red-headed fifth-grade son, Jonathan Foster, danced with joy when she initially gave him the sweatshirt a few weeks before he was kidnapped on Christmas Eve 2010. He swore he would always wear it, she said.

But Houston police investigator Roger Chappell testified the sweatshirt, introduced as evidence Friday, was found stuffed in a trash can outside the apartment of the boy's accused killer, Mona Nelson. It also had drops of Nelson's blood splattered on the back, prosecutors said.

This sweatshirt, a burned area rug that a cadaver dog indicated had the scent of a dead body, and some singed twine similar to what had bound the boy's arms were pulled from that trash can. The 12-year-old's body was badly charred when found four days after his disappearance, stuffed inside a culvert in a ditch not far from his home.

Welding equipment, which could match the burn patterns found on the boy, also was taken from Nelson's home after police obtained a search warrant. It was also introduced into evidence.

As they conducted the search, police were questioned by Nelson, 47, about what they would do with her confiscated equipment.

"I told her that we were checking to see if this could be evidence," Sgt. Chappell said, "And then she said, 'Well, then, it's yours. I'm not going to get it back.' "

Nelson, an apartment maintenance worker and former boxer, has pleaded not guilty to the capital murder charge.

During the first week of the trial, her attorney, Allen Tanner, has sought to point a finger at Jonathan's stepfather as a possible suspect in the boy's death.

Tanner has contended Angela Davis's estranged husband, David Davis, is the only one "with a motive to kill the boy." Prosecutor Connie Spence has admitted that she can only show how Nelson committed the murder but "not why."

Jonathan had only been living with his mother and her new husband for a month before he was killed, his mother testified. His grandmother had kept him until he turned 12, and it was his "birthday wish" to be reunited with his mother.

But Angela Davis told the court that her marriage was stormy, noting her husband would often become violent when he drank, forcing her once to seek hospital treatment.

The couple separated 10 days before Christmas Eve. Davis said she had packed up and moved with her son to a nearby duplex after her husband slapped Jonathan, leaving a red mark on his cheek.

However, David Davis, wearing a memorial button with the boy's photo, told the court Thursday that he had been thrilled at becoming a father again at age 55 to a son. Especially, he said, since he'd already raised three daughters.

Davis described the 12-year-old as a "happy little go-getter" whom he enjoyed watching after school and taking on daily bike rides. Under cross examination Friday, he acknowledged telling police that the boy was a "crybaby" and he was "tired of baby-sitting" him.

Prosecutors presented video surveillance recording that they believe proves the stepfather couldn't possibly be the killer. The tape shows Davis drinking beer at a local ice house from about 2 p.m. to 3:30 p.m., the critical period when the boy disappeared. He also received three cellphone calls while there.

But the defense noted that mechanism stamping the time and date on the recording was "way off" and had to be manually reconfigured. Testimony resumes Monday.